A31s datasheet
http://share.eepw.com.cn/share/download/id/194586
SINA31s_BOTTOM_Schematic
http://share.eepw.com.cn/share/download/id/194587
SINA31s_CPU_Schematic
http://share.eepw.com.cn/share/download/id/194588
SINA31s_Datasheet
http://share.eepw.com.cn/share/download/id/194589